The merger of two successful events to form the 30th International Conference on Modelling, Monitoring and Management of Air and Water Pollution provided the papers that are published in this volume. Many important air pollution issues are discussed, demonstrating the widespread nature of the air pollution phenomena and the in-depth exploration required to address their impacts on human health and the environment. In addition, the topic of Water Pollution is discussed in a number of contexts across different areas of water contamination. The environmental problems caused by the increase of pollutant loads discharged into natural water bodies requires the formation of a framework for regulation and control. This framework needs to be based on scientific results that relate pollutant discharge with changes in water quality. The results of these studies allow the industry to apply more efficient methods of controlling and treating waste loads, and water authorities to enforce appropriate regulations regarding this matter. Environmental problems are essentially interdisciplinary. Engineers and scientists working in this field must be familiar with a wide range of issues including the physical processes of mixing and dilution, chemical and biological processes, mathematical modelling, data acquisition and measurement, to name but a few. In view of the scarcity of available data, it is important that experiences are shared on an international basis. Thus, a continuous exchange of information between scientists from different countries is essential.